【摘要】 目的:观察碳酸酐酶Ⅱ(CA2)在人睾丸、精子中的表达定位及比较CA2在生育男性和弱精子症患者精子中的表达差异。方法:通过免疫组化观察CA2在人睾丸中的定位;通过免疫荧光观察CA2在人精子中的定位;收集健康生育男性和弱精子症患者的精液标本各16份,60%Percoll分离精液标本,排除生精细胞和白细胞,采用Western印迹方法,从蛋白水平检测CA2的表达。结果:免疫组化结果显示CA2在人睾丸中特异性定位于长形精子的尾部;免疫荧光结果显示CA2在人精子的尾部有较强表达。Western印迹结果显示弱精子症患者精子中CA2的表达显著高于生育男性(1.84±0.32vs1.41±0.26,P<0.05)。结论:CA2在睾丸生精周期的长形精子阶段才表达,定位于精子的尾部。CA2在弱精子症患者精子中表达显著增高,提示其可能与精子活动力下降有关。更多还原

【Abstract】 Objective:To investigate the expression of carbonic anhydrase Ⅱ (CA2) in human testes and spermatozoa,and to compare the expressions of CA2 in ejaculated spermatozoa between normozoospermic and asthenozoospermic men. Methods:The localization of CA2 in human testes was observed by immunohistochemistry,and that in human sperm by immunofluorescence. Western blot was used to detect the expression of CA2 in the semen samples obtained from 16 normozoospermic and 16 asthenozoospermic volunteers. Results:The CA2 protein was shown to be localized in the tail of elongating spermatids by immunohistochemistry and in the flagellum of human sperm by immunofluorescence. Western blot revealed an obviously increased expression of CA2 in the spermatozoa of asthenozoospermic patients,with statistically significant difference from the normozoospermic group (1.84 ± 0.32 vs 1.41 ± 0.26,P < 0.05). Conclusion:The CA2 protein is expressed in the spermatogenic stage of elongating spermatids in human testes and localized in the sperm tail. The expression of CA2 is significantly increased in the spermatozoa of asthenozoospermic men,which might be responsible for low sperm motility.更多还原